<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      margin: 0;
      padding: 0;
      font-family: "kaiti";
    }
    form{
      width: 300px;
      height: 200px;
      background-color: cadetblue;
      margin: 100px auto;
      box-sizing: border-box;
      padding: 10px 4px;
    }
    input{
      width: 290px;
      height: 50px;
      text-align: center;
      font-size: 20px;
      color: lightgreen;
      margin-bottom: 10px;
    }
  </style>
</head>

<body>
  <form action="http://localhost:3000/dologin" method="post">
    <input type="text" name="username" placeholder="请输入用户名"><br>
    <input type="text" name="password" placeholder="请输入密码"><br>
    <input type="submit" value="登录" >
  </form>
</body>

</html>